Spear



li ate'nted nne l, H929.-

fi naaei stares aranr series."

ERQUZJE VENTRE$CA, E HOUSTON, TEXAS.

Senna.

Application filed July 13, 1328.. Serial No. 29%,d22.

such as drill stem or casing, from the well.

It may he employed as a fishing tool to engage pipe broken 0K in the well; or may he employed in pulling casing when a well is abandoned. It is adapted for insertion downwardly within the pipe and to be then hxpanded to engage the pipe so as to allow the pipeto be pulled from the, well.

It is an ob ect of the invention to pro 16 vide a spear which may be readily expanded to engage the pipe and which may be also readily released to be disengaged ifrom the pipe if the pipe is lodged in thewell so that it may not be removed. The invention resides particularly in the simple construction of the-device and the positive manner in which it may be operated wthout failure in use.

Referring to the drawing herewith where-' in a preferred form of my device is disclosed, Fig. 1 is a central longitudinal sectionthrough-a spear, embodying my inv'en tion. Fig. 2 is a transverse section on the plane 22 of Fig. 1. Fig. 3 is a transverse section on the plane 3-3 of Fig. 1.

In the construction of my device 1 employ a central tubular mandrel 5 which may be made of heavy pipe, the upper end being threaded at 6 for engagement with a releasing sleeve 7. The lower end is also threaded on its outer surface at 8 toeng-age with a nut or collar 9. At a point intermediate the ends of the mandrel I form a radially extending flange 10, having thereon an upper shoulder 11, the purpose of which will be later explained. Above the nut is an upwardly tapered expanding sleeve 12. lhis sleeve is slidable upon the mandrel between the flange 10and the nut-9 and its outer surface is tapered at 13 to receive the jaws 14 which are. adapted to cooperate therewith.

5 will be seen fromFigQB, I have employed 1 three such jaws. The inner surface of-said ,-'jaws' is tapered at the proper angle to'fit or collar 9 at the lower side The jaws '14 are arcuate in shape and, as.

said ring having an inwardly directed flange 17 to fit within a groove in the lower end of a sleeve 18. The jaws are thus loosely sus pended and bear by gravity against the outer surface of the expanding sleeve 12.

The sleeve 18- upon which the jaws or slips 14 are supported is'shaped to lit loosely 'over the mandrel 5 and to be slidalole there on. Said sleeve 18, as will be seen from Fig. 2 has along its outer surface a plurality of vertical grooves or key-ways l9. Said lrey ways extend from the upper end of the sleeve downwardly to a'p'oint indicated at 20 adjacent the lower end thereof and in these lreyways the flanges 16 upon the jaws or slips 7o 14 may slide. At the lower end of the lie way the jaws will be supported upon t e shoulders 20, as will be seen from Fig. l. The upper end of the sleeve 18 is threaded with a coarse thread 21 which extends from '15 the upper end to a point about midway of the sleeve.

The releasing collar 7 which receives the upper end of the mandrel 5 is formed with an upper threaded shank 22 which is adapt as ed to be engaged by adrill collar or other similar coupling. it is of materially larger diameter-than the sleeve 21- and is formed wlthan inner thread 23 to engage with the thread 21 on said sleeve 18. The thread 23 as is a short thread and l have shown but twoturns of this thread on the-releasing collar. Below the threads the portion 2a is a smooth surface adapted toslide dver -the sleeve 18. In operating my device the sleeve 18 is screwed'downwardly in the releasing sleeve 7 so that the jaws 14- are free to slide upwardly along the key-ways therein. ii/hen the proper position in the well has been: reached where the pipe is to be gripped the device will be drhwn upwardly and the engagement of the jaws 14 with the pipe will 'tend to pull themdownwardly on the'tapered surface 13 of the sleeve 12. This will tend ,toforce the jawsinto clamping engagement with the pipe so its t firmly grip the same. A further upward pull upon the spear will tend to pull the pipe thus engage'd by the jaws inv an upward direction and in this manner the pipe may be with drawn from the well. f If, however, it is found that'tha pipe thus ggippd cannot be removed and cannot washed loose from the well through .fluidpumped downwardlythrough the we wardly from between releasethe jaws.

central passage 25 the. jaws v will have to be released from their hold upon the ipe, This may be done by driving the collar 12 from beneath the jaws 14, allowing .the jaws to collapse. The collar may .thus be driven from beneath the pipe gripping jaws by a downward thrust upon the mandrel 5. downwardly it will, carry with it the sleeve 18 which will move relative to the upper ring 16 of the jaws and the flange 10 on the mandrel will be brought against the upper end of the collar 12, :tending toforce it downthe jaws 14. A few strokes of the mandrel in this ,rnanner will After this has been done the mandrel and releasingsleeve 7 will be rotated downwardly over the sleeve 18 to, in effect, draw said sleeve 18 together with the jaws 14, upwardly awa from the sleeve 12. When thus suspended above the expanding sleeve the jaws will fall inwardly away from the casing may be easily withdrawn. v V

. It will be noted that my device is certain and eflective in its operation and will tend to function positively at all times. A featureof particular value connected therewith is the manner in which the jaws may be released from'the pipe' when a release is desired. Theprovision for striking a blow upon" theexpanding sleeve 12 to allow the collapsing of the jaws 14,- away from the pipeis particularly effective and will not fail in use. I

Having thus described my invention, what I' claim as new is:

1. A spear comprising a mandrel, an upwardly tapered expander sleeve slidable on the lower end thereof,

on said mandrel above said flange, a ring slidable on said guide sleeve, slip aws depending from sald ring and shaped to fitv upon said expander sleeve and to be forced outwardly to grip a pipe, said flange being adapted to be forced against said expander sleeve'to jar it from beneath said jaws.

2-. A spear comprising a mandrel, an upwardly tapered expander sleeve slidable on the lower endthereof, a radial flange on said mandrel above said sleeve, a guide sleeve on said mandrel above said flange, a ring slidable on said guide sleeve, slip jaws depending fromsaid ring and shaped to fit upon said expander sleeve and to be forced outwardly to grip a pipe, said flange being adapted to be forced against said expander sleeve to jar it from beneath said 'jaws, and means whereby said guide sleeve and ring may be drawn upwardly *on said manp to support said When the mandrel is thus forced or-pipe and the device expander sleeve from a radial flange on saidmandrel above said sleeve, a guide sleeve.

sleeve and means on said mandrel engaging 3. A spear including a mandrel, an upwardly' tapered expander sleeve slidable thereon, a. pluralityof slip jaws shaped to fit slidably upon said expander sleeve, means aws, and means onsai mandrel to strike a blow upon said expander sleeve for the purpose described.

4. A mandrel, a guide sleeve thereon, an upwardly tapered expander sleeve on said mandrel below saidiguide sleeve, a ring slidable on said guide sleeve, aplurality of jaws on said ring tapered .on their inner faces to fit said expander sleeve and be expanded outwardly to grip a pipe, and means to drive said expander sleeve from beneath said jaws;

5. A mandrel, a guide sleeve thereon, an upwardly tapered expander sleeve on said mandrel below said guide sleeve, a ring slidable on said guide sleeve, a plurality of jaws on said ring tapered on their inner facesto fit said expander sleeve and be expanded outwardly to grip a pipe, and means to drive said expander sleeve from beneath said jaws, said driving means including means on said mandrel operating on a downward move-. ment thereof.

6. A mandrel, a guide sleeve thereon, an

upwardly tapered expander s eevc on saidmandrel below able on said guide sleeve, aplurality of jawson said ring tapered on their inner faces to fit saidexpander sleeve andbe expanded out-- wardly to grip a pipe, and means to drive-said beneath said jaws and means on said mandrel engaging said guidesleeve to move said sleeve/and jaws upwardly, responsive to the rotation of said mandrel. 7 A spear including a mandrel, an expander sleeve thereon, means-to support said sleeve, a guide sleeve on said mandrel, a

plurality of jaws supported slidably but nonrotatably upon said guide sleeve, said jaws being adapted to fit upon said expander sleeve and means on said mandrel engaging said guide sleeve to move it upwardly.

8. A spear including a mandrel, an ex: pander sleeve thereon, means to support said sleeve, ;a guide sleeve on said mandrel, aplurality of jaws supported slidably' but nonrotatably upon said guide sleeve, said jaws' being adapted to fit upon said expander said guide sleeve to moveit upwardly and x a' flange on said mandrel above said expander sleeve for, the purpose set forth.

In testimony whereof I hereunto affix my signature this 10th day of July, A. 'D. 1928.

YERCOLE VENTBESCA.

said guide sleeve, a ring slid-' I 

